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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82e4bed7a21b843c7dd5c712e02eb28a6751b891ea969eb549b9a5f37d28c39' 
  AND token = 'fikzXLe8EwMCxGfrlDYM/Iz5Ff098AWRgPVYtz6nre0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}